Worst air pollution San Ramón, today and tomorrow
Today (16 July): Air quality in San Ramón is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (O3: 12.1/100).
Tomorrow (17 July 2026): Air quality in San Ramón is good. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 16.9/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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San Ramón in Santiago reflects the Santiago metropolitan area's southeastern residential corridor in the Central Valley, with vehicle traffic on surrounding roads and the dense urban residential and commercial character contributing local sources under the Santiago basin's persistent temperature inversions. The enclosed Central Valley's near-complete topographic trapping compounds emissions extensively, while San Ramón shares the broader Santiago metropolitan air quality challenges throughout most of the year.
Today - 16 July | Pollution peaks at 22:00
AQI:
Good
12.1/100
PM2.5 (fine particles):
Good
9.5/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
12.1/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
1.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Good
16.9/100
PM2.5 (fine particles):
Good
10.2/100
PM10 (coarse particles):
Good
4.8/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
16.9/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.3/100
PM1 (ultrafine particles):
Good
1.9/100
Frequently Asked Questions
Is air quality bad in San Ramón right now?
On 16 July 2026, overall air quality in San Ramón is good. AQI is the main air quality indicator at 12.1/100. Pollution peaks around 10:00 PM (O3: 12.1/100).
Will air quality be worse tomorrow in San Ramón?
On 17 July 2026, air quality conditions in San Ramón will be similar to today, with AQI forecast at good at 16.9/100. Pollution peaks around 11:00 PM (O3: 16.9/100).
When is air pollution at its worst in San Ramón?
Air quality in San Ramón tends to be worse when road traffic and temperature inversions set in over the valley. The surrounding valley terrain holds pollutants near the surface rather than letting them disperse. This tends to happen most in winter, when inversions are most common.
Are air quality levels in San Ramón based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app